Highest temperature in Chengdu on August 1?

Platform comparison

Market context

Chengdu’s airport high for 1 August will settle on the day’s maximum temperature at Chengdu Shuangliu International Airport Station, so the market is really a read on whether the city gets an ordinary hot August day or a brief spike above seasonal norms. Long-run August climate data point to typical highs around 30–31°C, with average early-August highs near 33–34°C in some travel datasets and a broader monthly ceiling often described in the low-to-mid 30s Celsius; extreme late-summer heatwaves can push Chengdu towards the high 30s, but those are outliers rather than the base case.[2][3][6][8][11][19]

That context makes a 0% YES price look detached from climatology unless the contract’s temperature bands are exceptionally high. On comparable books, Polymarket usually displays this as an implied probability, while Kalshi and Betfair/Smarkets tend to surface prices as decimals or odds, so the same view can look numerically different once fees are included. For a weather market like this, the key comparison point is not just the headline price but whether the platform is available to the trader: KYC and jurisdictional access vary materially between Polymarket, Kalshi, Betfair and Smarkets, which can matter more than the forecast itself when liquidity is thin.

The main catalysts are local forecast updates, especially the evolution of afternoon heat, cloud cover and rainfall risk, because Chengdu in August is both hot and monsoonal, with humidity and showers often suppressing the day’s peak even when the morning starts warm.[3][6][17][19] By settlement, traders should watch the airport station forecast and any higher-than-normal heat advisories from Chinese meteorological sources, since a late-day burst of sun can move the recorded maximum by a couple of degrees and shift the outcome between adjacent temperature bands.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on August 1? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.